US Bridges

T 31 over Stony Brook

Good

Jackson County, Minnesota · 1.7 MI N of JCT Csah 4 · Structure no. 32538

Built
1993
32 years old
Condition
Good
inspected September 2023
Type
Slab
Wood or Timber
Length
84 ft
3 main spans
Daily traffic
40
1992 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

T 31 over Stony Brook is a wood or timber slab carrying T 31 over Stony Brook in Jackson County, Minnesota. It was built in 1993, so it is 32 years old, younger than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40 vehicles a day, projected to reach 40 by 2029. The structure is 84 ft (25.6 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesT 31
CrossesStony Brook
Location1.7 MI N of JCT Csah 4
RouteCounty Highway 31
Coordinates43.5471, -94.97448
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.6 US tons
Inventory rating54 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 25 or greater
Structure length84 ft (25.6 m)
Longest span28 ft (8.5 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (1992)
Projected traffic40 by 2029
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$166 million
NavigationNo navigation control on waterway

Frequently asked questions

When was T 31 over Stony Brook built?

It was built in 1993, making it 32 years old in 2025.

What condition is T 31 over Stony Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does T 31 over Stony Brook carry?

About 40 vehicles per day (1992 count).

How long is T 31 over Stony Brook?

The structure is 84 ft (25.6 m) long with a longest span of 28 ft (8.5 m) and a deck 30 ft wide.

Who owns T 31 over Stony Brook?

It is owned by the Town or Township Highway Agency.